Molding-machine



J. W. DEARSLEY.

MOLDING MACHINE.

APPLICATION FILED APR. 8, 1919. "1,325,006. Patented Dec. 10,1919.

2 SHEETS-SHEET I.

INVENTOR ATTURNEY 1. w. DEARSLEYLI MOLDING MACHINE.

APPLICATION FILED APR. 8. 1919.

"1 ,325,006, Patented Dec. 16, 1919.

'2 SHEETS-SHEET 2.

- WITNESS INVENTOH 4 zz/av;

. ATTO H N EYS PATENT OFFICE.

JOHN W. DEARSLEY. OF RACINE. WISCONSIN.

MOLDING-MACHINE.

Specification of Letters Patent.

Patented Dec. 16, 1919.

Application filed April 8, 1919. Serial No. 288,607.

To all whom it may concern Be it known that 1, JOHN V. DEARSLEY, a citizen of the United States, and resident of Racine, in the county of Racine and State of 'isconsin, have invented certain new and useful Improvements in Molding llachines;

and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to new and useful improvements in devices for adjusting the length of stroke of a reciprocating piston, and is more particularly directed to the embodiment of such an arrangement in a pneumatically operative molding machine, whereby to provide for variation of the degree of movement of the pattern shifting member of the machine;

It is in general the object of my invention to simplify and otherwise improve the structure and to increase the efficiency of devices of this character.

More particularly, it, is my object to provide a stroke adjusting mechanism for a piston, which is carried entirely by the piston and which is readily operable from a point exterior of the cylinder in which the piston travels. I

\Vith the above and other objects in view, which will be apparent as the description proceeds, my invention resides in the novel features of construction, combination and arrangement of parts as hereinafter described and defined by the appended claims, it being understood that changes in the precise embodiment might be made by those skilled in the art. without departing from the spirit of the invention.

l igure 1 is a vertical sectional view through the base portion of a molding machine embodying my invention.

Fig. 2 is a transverse sectional view therethrough on the line 22 of Fig. 1.

Referring now more particularly to the accompanying drawing, 5 designates the main standard of the molding machine constituting the present embodiment of my invention, this standard being tubular in shape and having its lower portion flared to form the supporting base 6, the standard 'being provided at its upper end with an outwardly extending annular flange 7 to which is secured the bottom 8 of the pattern stripping portion of the machine, the upper portion of the machine forming no part of my invention and being hence not specifically shown. A lower cylinder head block 9 is secured in the lower portion of the standard and an upper cylinder head block 10 is mounted in the upper portion of the standa rd. the ends-of a cylinder 11 being threaded 111 these blocks and thus mounted concentrically in the standard and closed at its ends by the blocks.

lieciplocable in this cylinder is a piston comprising extensibly connected upper and lower sections A and B respectively. The upper piston section A comprises a block 12 substantially equal in diameter to the diameter of the cylinder and connected by screws 13 with a superposed block-14 of slightly smaller diameter, a cup shaped washer 15 being clamped between these blocks by the action of the screws 13. The stem 16 of the piston is threaded on the upper block let, thi piston stem being tubular in the present instance and slidably extending through the upper cylinder hcad 10, said head being reccsscd for the reception of packing 17 and a follow sleeve 18 to provide a packing gland for the piston stem. The lower piston section comprises an upper block 19 substantially equal in diameter to the diameter of the cylinder and connected by screws with a lower block 21 whereby to clamp a cup shaped washer member 22 therebetween. The connection of the piston section is effected by a screw shaft 23 which has its lower end secured in the block 19 and which is passed through the blocks 12 and 14 of the upper piston section A, said shaft being in threaded connection-with the latter block. The upper end of the shaft terminates adjacent the upper end of the piston stem and is squared for the reception of a suitable wrench.

The piston stem 16 is utilized in the usual manner to carry the pattern crab plate 2 1, which seats on an annular shoulder 25 outstanding from the upper portion of the piston stem and which is retained in place by a centrally apertured cap 26 threaded on ion in either direction, no specific construcand threaded to pass through the first tin; is shown therel'or. named piston section and disposed in the An exceedingly simple arrangement has tubular stem. thus been provided whereby the operative 3. The combination with a cylinder, of

stroke of the piston may be adjusted by reaa pair of piston blocks therein, a member son of its extensible nature, and this adjustsecured to each of said blocks, a cupped ment may obviously be efiected without inwasher disposed between each block and a tcrt'ering with the sealing of the cylinder. corresponding member and having its pe- While 1 have shown my improved stroke ripheral bearing portion turned to engage 40 adjusting means as particularly applied to the cylinder, a tubular stem secured to one a molding machine it will be appreciated of the piston blocks and extending outthat the adjusting means may find use in wardly of the cylinder, and a shaft secured other connections and that various changes to the other piston block and threaded in and modifications of the structure herein the first named piston block, said shaft beillustrated may be employed to meet difi'ering extended in the stem to provide means mg conditions of use and manufacture withfor adjustably spacing the piston blocks.

out departing in any manner from the spirit 4. A machine of the class described inof the invention. eluding a tubular base standard, a pattern What is claimed 15: stripping portion mounted on said standard,

1. The combination with a cylinder of a a vertical cylinder mounted in the standard, piston disposed therein, means for procura piston in the cylinder, a tubular stem for mg reciprocation of the piston, a tubular said piston extending through the top of stem on the piston extending outwardly of said cylinder, a pattern crab plate mounted the cylinder and means disposed in said on the upper end of the stem, and means stem and extending into the cylinder for disposedin said tubular stem and extendvarying the length of stroke of the piston. ing into the cylinder for varying the length 2. The combination with a cylinder of a of stroke of the piston. pair of piston sections slidable therein, a In testimony that I claim the foregoing l tubular stein extending from one-of the pishave hereunto set my hand at Racine, in the 0 ton sections outwardly of the cylinder and county ot' Racine and State of Wisconsin.

a shaft secured to the other piston section JOHN W. DEARSLEY. 

